ditson



1. DITSON.

HOIST.

APPLICATION-FILED JULY 20. 1921.

INVENTOR Jaaegflzssm ATT NEY} UNITED STATES PATENT OFFICE.

JESSE DITSON, OF LITTLETON, COLORADO, ASSIGNOR TO INGERSOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY.

I-IOIST.

Application filed July 20,

To all whom it may concern:

Be it known that I, Jessa DITSON, a citizen of the United States, and a resident of Littleton, county of Arapahoe, and State of Colorado, have invented a certain Hoist, of which the following is a specification, accompanied by drawings. 7

This invention relates to hoists, but more especially to a power driven hoist of the double drum type, in which either drum may be driven from a common driving shaft Such hoists are particularly useful for haulage purposes or in connection with other work in which the load is carried by a continuous rope or cable adapted to be wound up on the haulage or lifting drum as it is unwound from the tail rope drum.

The objects of the invention are to enable two drums, as for instance, a haulage drum and a tail rope drum, to be driven from a common source by improved means and devices which automatically disconnect one drum, and connect the other drum to the driving shaft in accordance with the direction of rotation of the shaft.

Further objects of the invention are to produce a simple, compact,- rugged and highly eflicient selfcontained hoist combining a source of power and driving and driven elements within and upon one mounting, so constructed that all the operative parts are readily accessible and easily assembled and disassembled.

Further objects will hereinafter appear and to all of these ends the invention consists of the hoist described and claimed in this specification and shown in one of its preferred forms in the accompanying drawings, in which V v v Figure 1 is a side elevation of the hoist.

Figure 2 is a longitudinal sectional elevation on the line 22 of Figure 3,

Figure 3 is a transverse sectional elevation on the line 33 of Figure 2,1ooking in the direction of the arrows, and V Figure tis a view similar to Figure 3 with the pawl in a different position. v

Referring to the drawings, the base plate A on which the hoist is mounted, is provided with a clamping member preferably in the form of a saddle clamp B having the clamping bolts C for securing the hoist to a column, cross bar or other support. Any suitable motor may be provided for the hoist and in this instance a fluid pressure motor Specification of Letters Patent.

Patented June 27, 1922.

1921. Serial No. 486,097.

is indicated, comprising the cylinder D mounted on the frame E bolted to the base plate as b 1 means of the bolts F. A cylinder head & is secured to the cylinder by the cap bolts H and fluid pressure, as for instance compressed air, is supplied to the motor through the inlet J controlled by a suit able valve K in the valve chest L and manipulated by the valve lever O. In this instance, the motor is assumed to be a reversi ble motor the reversal of which is controlled by the valve lever 0. An oiling device P of any suitable type .may be supplied to the motor.

A center bearing Q shown in this instance in the form of a shell, having a tubular body and a flanged portion R is connected to the motor cylinder D and the cylinder head G by means of the cap bolts H. The opposite end of the center bearing is supported in the gear box S, which is secured to the frame A. by the bolts T. A center bearing retain ing screw U suitably secures the center bearing to the inner wall V of the gear box S. An oiling connection may be provided upon the gear box. The gear box cover X is secured to the gearbox by means of the bolts Y. The construction of the motor and frame so far described forms a simple and compact frame for the hoist, easily assembled and disassembled and permitting ready accessibility to the operative parts of the hoist. a

A main driving shaft a passing centrally through the center bearing Q, is supported in the ballbearings b and c and provided with the crankdisc d having the crank pin e connected to the piston f of the motor by means of the ball-bearing so that the driving shaft a operates throughout in ball-bearings.

A drivingpinion h is keyed to the driving shaft a and a retaining washer y is held against the driving pinion by means of the pin 70. The driving pinion h meshes with an intermediate gear 0 keyed to the counter shaft 29 operating in the ball-bearings g and 77 mounted in the gear box S. An intermediate pinion s on the counter shaft p meshes with the internal gear 25 of the main driver u adapted to rotate on the center bearing Q, from which power is taken for driving either one of the two drums.

The haulage drum o to which one length of the rope w is adapted to be connected, rotates upon the center bearing Q, and the concentric tail rope drum 2: to which the tail rope y is connected preferably rotates upon the haulage drum c as indicated particularly in Figure 2. Such construction of concentric drums materially reduces the over-all length of the hoist and produces'a more compact and better balanced hoist than heretofore.

Means are provided for automatically connecting the main driver u to one or the other of the drums c and w in accordance with the direction of rotation of the driving shaft a, and for this purpose the haulage drum 1) is provided with a driver 2 preferably in the form of a ring having clutch members in the form of teeth 2 merging into cam surfaces 3. The driver 2 is suitably secured to the haulage drum by means of the bolts 4, and for convenience of description may be termed the inner driver.

The tail rope drum 0c is likewise provided with a driver 5 opposed to the driver 2 and preferably in the form of a ring having clutch members in the form of teeth 6 facing in the opposite .direction from theteeth 2 on the driver 2 and. merging into the cam surfaces 7. The driver 5 is secured to the tail rope drum m by means of the bolts 8, and for convenience of description may be termed the outer driver.

The terms inner and outer as applied to the opposed drivers 2 and 5 carried by the drums respectively, are not to be understood as necessarily limited to ratchet rings concentric with the axis of rotation of the machine, but are intended to be used as suitable designations for two opposed ratchet faces for the drums, having reference to some fixed point of the machine, which obviously need not be the driving shaft.

The main driver a is provided with a movable clutch member 9, preferably in. the form of a pawl, slidable substantially radially between the lugs 10 projecting inwardly from the main driver it into a position between: the inner driver 2 and outer driver 5, so that the pawl 9 may engage either one of the inner or outer drivers as indicated in Figures 3 and 4, in accordance with the direction of rotation of the driving shaft a.

In the operation of the hoist, if it be assumed that the driving shaft a is rotated in the direction of the arrow 11 in Figure 3, the main driver a will be rotated by the train of gearing described, in the opposite direction, and the pawl 9 will have been pushed. by one of the cam surfaces 3 on the inner driver a into engagement with one of the teeth 6 of the outer driver 5 thus driving the tail rope drum m in the same direction as the main driver but in the opposite direction to the rotation of the driving shaft 0,. The arrow 12 in Figure 1 on the tail rope drum 00 indicates the direction of rotation of; said drum under such circumstances when power is applied to the drum to wind up the tail rope. The haulage drum 1) is disconnected from the driving shaft a but is freely rotated in the same direction as the tail rope drum :0 as the rope is unwinding from said haulage drum.

Upon reversing the direction of rotation of the driving shaft (1 and causing it to rotate in the direction of the arrow 13, in Figure 4, the direction of rotation of the main driver at will be reversed and the pawl 9 will be pushed by one of the cam surfaces 7 on the outer driver 5 into engagement with one of the teeth 2 on the inner driver 2 thus driving the haulage drum c in the direction of the arrow 13 in Figure 1 oppositely to the direction of rotation of the driving shaft. In such case, the rope will be wound up on the haulage drum and the tail rope drum will be rotated freely in the same direction as the haulage drum, asthe rope is unwound from the tail rope drum. One drum or the other will be automatically connected to be driven from the driving shaft as often as the direction of rotation of the driving shaft is reversed. In a hoist of the character described, a brake is preferably provided for one of the drums, it being unnecessary to provide a brake for both drums in accordance with my construction. In this instance, the tail rope drum a2 may be conveniently provided with a flange 14 to which a brake band 15 having a suitable lining 16 is applied. A brake lever 17 is fulcrumed at 18 on the lugs 19 and one looped end 20 of the brake band is connected to a pin 21 on the brake lever 17 located further away from the fulcrum 18 than the pin 22 to which the other looped end. 23 of the brake band is connected. A compression spring 24 beneath the shorter arm 25 of the brake lever is adapted to be compressed between an adjusting screw 26 and the frame A. A set screw 27 holds the adjusting screw 26 in adjustment. Pressure upon the longer arm of the brake lever 17 tightens the brake on the tail rope drum :0, and controls the rotation of both drums, as long as the drums are connected through the agency of the cable and are doing work. It is obvious also that owing to the positions of the pins 21 and 22 relative to the brake lever fulcrum 18, the brake will be automatically tightened by friction between the flange 141. of the tail rope drum on and the brake lining 16 in case the drums should accidentally tend toretate backwardly in the opposite direction from that in which power is applied. The brake therefore acts as an automatic safety device. 7

I am not to be understood as limiting the invention to the particular devices and constructions shown in the drawings, and de,--

scribed in the specification, since those skilled in theart may devise quivalent con-- struc'tions within the spirit of my invention as defined in the appended claims.

I claim:

1. In a hoist, the combination of a frame, a driving shaft, two drums concentric with the driving shaft, a motor connected to operate the driving shaft, and means for automatically disconnecting one drum and connecting the other drum to the driving shaft in accordance with the direction of rotation of the driving shaft.

2. In a hoist, the combination of a frame, a driving shaft, two drums concentric with the driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by said drums respectively, a main driver rotating with the driving shaft, and means for automatically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft.

3. In a hoist, the combination of a frame, a driving shaft, two drums concentric with the driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by said drum respectively, a main driver rotating with the driving shaft, and a movable member carried by the main driver for automatically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft.

4. I11 a hoist, the combination of a frame, a driving shaft, two drums concentric with the driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by said drums respectively, a main driver rotating with the driving shaft, and a pawl carried by the main driver for automatically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft.

5. In a hoist, the combination of a frame, a driving shaft, two drums concentric with the driving shaft, one drum being rotatable upon the other drum, a motor connected to operate the driving shaft, inner and outer concentric drivers carried by the said drums respectively, a main driver rotating with the driving shaft, a movable member carried by the main driver and located between the inner and outer drivers, and means for automatically actuating said movable member to connect the main driver to one or the other of the inner and outer drivers in ac cordance with the direction of rotation of the driving shaft.

6. In a hoist, the combination of a frame, a driving shaft, two drums concentric with the driving shaft, one drum being rotatable upon the other drum, a motor connected to operate the driving shaft, inner and outer concentric drivers carried by the said drums respectively, a main driver rotatingwith the driving shaft, a pawl carried by the main driver and located between the inner and outer drivers, and means for automatically actuating said pawl to connect the main driver to one or the other of the inner and outer drivers in accordance with the direction of rotation of the driving shaft.

7. In a hoist, the combination of a frame, a driving shaft, two drums concentric with the driving shaft, a motor connected to operate the driving shaft, means for automatically disconnecting one drum and connecting the other drum to the driving shaft in accordance with the direction of rotation of the driving shaft, and a brake for one of said drums.

8. In a hoist, the combination of a frame, a driving shaft, two drums concentric with the driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by said drums respectively, a main driver rotating with the driving shaft, a movable member carried by the main driver for automatically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft, and a brake for one of said drums.

9. In a hoist, the combination of a frame, a driving shaft, two drums concentric with the driving shaft, a motor connected to operate the driving shaft, opposed drivers carried by said drums respectively, a main driver rotating with the driving shaft, means for automatically connecting said main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft, and a brake for one of the drums adapted to automatically tighten and retard rotation in a direction counter to power applied by the driving shaft to said drum.

10. In a hoist, the combination of a frame, a driving shaft, a motor connected to operate the driving shaft, a haulage drum, and a tail rope drum concentric with the driving shaft, the tail rope drum being mounted to rotate upon the haulage drum, a driver carried by the haulage drum, an opposed driver carried by the tail rope drum, a main driver rotating with the driving shaft, a movable member carried by said main driver between the said opposed drum drivers and means automatically actuating said movable member to connect the main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft.

11. In a hoist, the combination of a frame, a driving shaft, a motor connected to operate the driving shaft, a haulage drum, and a tail rope drum concentric with the driving shaft, the tail rope drum being mounted to rotate upon the haulage drum, a driver carried by the haulage drum, an opposed driver carried by the tail rope drum, a main driver rotatin with the driving shaft, a movable mem er carried by said main driver between the said opposed drum drivers, means automatically actuating said movable member to connect the main driver to one or the other of the said opposed drivers in accordance with the direction of rotation of the driving shaft, and a brake forone of said drums.

12. In a hoist, the combination of a frame, a driving shaft, a motor connected to operate the driving shaft, two concentric drums, an inner driver on one drum in the form of a ring having external teeth, an outer driver on the other drum in the form of aconcentric ring having internal teeth, a main driver rotating with the driving shaft, and a radially movable pawl carried by said main driver and adapted to engage the teeth ofthe inner or outer driver in accordance with the direction ofrotation of the driving shaft.

13. Ina hoist, the combination of a frame, a driving shaft, a motor connected to operate the driving shaft, two concentric drums, an inner driver on one drum in the form of a ring having external teeth merging into cam surfaces, and an outer driver on the other drum in the form of a concentric ring having internal teeth facing oppositely to the teeth on the inner driver and merging into cam surfaces, a main driver rotating With the driving shaft, and a radially movable pawl carried by said main driver and actuated by said cam surfaces on the inner and outer drivers into engagement with the teeth on one or the other of said drivers in accordance with the direction of rotation of the driving shaft.

14. In a hoist, the combination of a frame, a driving shaft, a motor connected to operate the driving shaft, ahaulage drum and a tail rope drum concentric with the driving shaft,

the tail rope drum being mounted to rotate upon the haulage drum, an inner driver in the form of a ring on the haulage drum havingexternal teeth, an outer driver on the tail rope drum in the form of a concentric ring havin internal teeth, a main driver rotating wit the driving shaft, and a radially movable pawl carried by said main driver and adapted to engage the teeth of the inner or outer driver in accordance with the direction of rotation of the driving shaft.

15. In a hoist, the combination of a frame, a driving shaft, a motor connected to operate the driving shaft, a haulage drum and a tail rope drum concentric with the driving shaft, the tail rope drum being mounted to rotate upon the haulage drum, an inner driver in the form of a ring'on the haulage drum having external teeth merging into cam surfaces, an outer driver on the tail rope drum in the form of a concentric ring having internal teeth facing oppositely to the teeth on the inner driver and merging into cam surfaces, a main driver rotating with the driving shaft, and a radially movable pawl carried by saidmain driver and actuated by said cam surfaces on the inner and outer drivers into engagement with the teeth on one or the other of said drivers in accordance with the direction of rotation of the driving shaft.

In testimony whereof I have signedthis specification.

JESSE DITSON. 

